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@einen giants latrnt @Hita vFREBRIEUCK SHALLER, 0F HUDSON, VNEW YORK.

- Letters Patent No'. 67,810, dated-August 13, 1867.

IMPROVEMENT-1N TUHN'ING-LATHES.

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TO ALL WHOM IT MAY'CONCERN:

Be it known that I, FREDERICK SHALLB, 0f' Hudson, Ain the county ofColumbia, and State of.Ne\v York, have invented a new andusefulImprovement in Lathesifor Wntchmakcrs Use, and other purposes, of whichthe following is a full, clear, and exa-ct description, reference beinghad-to the accompanying drawing, forming partof this speciiication,'andin irhich I i i l Eigurel represents a side elevation ofa latheVconstructed as for vvratchmakers use, with my improvement applied toit. Y

Figure 2, a face view'of my improved chuck detached, and

Figures 3 and 4 diagrams in illustration of the action of' the same.

Similar letters4 of' reference Vindicate corresponding parts. v

'The nature of vmy invention consists, firstly, in` a novel constructionof ehuclc, applicable to watchmakers and other lathes, by a peculiarattachment to orconneetion therewith of a clamp or dogs for holding thework v under operation, and whereby the grip of the same i's madesecure, with a fixed or truev position of 'or for its Acentre. undervarying sizes or diameterspand my invention further consists in acombination, with a lathe puppet, ot an adjustable gauge and reversiblemale and female centring-pin.

Referring to the accompanying drawing, A represents the bed of, thelathe, carrying at one end the headstoclt'B, shwn asformed by branchesextending from andfmade in Vone piece with the standard C, which shouldbe adjustable, by a screw-knob and nut, in or alengn slotted bed below,suitably connected with the bench. `D is themandrel drivenby a. pulley,a, and carryingthe chuck E, which may be so litted to the mandrel as tobe rcmovalvlsl therefrom at pleasure,la-nd other chucks otl like ordifferent construction substituted therefor. This chuck E has pivoted toor on its v'ace dogs or bars F F, forming a clamp for..-holding thework, said bars being separately pivoted thereto, by pins b bl,ori-opposite sides ofthe lathes centre, at equal distances therefrom,and at points nfhich lie inside 'of their 'griping edges ec, and so thataline drawn to intersect said pivots will lie parallel tp the gripingedges-when they are parallel to each other.l By this 4lateralarrangement of the pivots b'b, relatively, the clamping Vfaces oftheibars, as 'clearly represented in iigsJ-Z and 3, not only may thebars F F have the clamping 'edges adjusted parallel to each other tohohl 'the workbut, hovveve'rvaried the size or diameter of work theyhold, aline drawnA at right angles from the 4one griping-edge to theother will intersect a commoncen tre, which is that of the mandrel.-vThis insures truth in centring tvithout trouble of adjustment, andavoids allfslipping of the working between or out of the bars, therebyperfectingzthe grip. VWere the bars pivoted, as represented in fig. 4,suehwould not be thev ease, as, in such arrangement, a. line drawn to'intersect ,the pivots does not llie parallel tothe gripingledges, nor,excepting when thebars are closed one against the'other, would a linedrawn at right angles from the one griprig-edge intersect the commoncentre of the lathe, consequently rendering diilicult both the centringand holding of they work against slipping. The diilerence thus describedbetween these two arrangements ofthe bars is clearly exhibited by blackand vred-lines in the diagrams, figs. 8 and 4, Screws old may be .uscdtotighteuup the clamping-bars F F to their grip on the work. This form ofchuck maybe used not only for watehmakers or jewellcrs, but for heavy ormachine work as n'ell. By it much time will be economized in centring.

G is the lathe-rest' and H its puppet, which is provided with areversible and longitudinally-sliding or adjustable' centring-ro'd. I.the saine lhaving a female` centre at one end and male .centre at theother, to suit different kinds of work, and being heldv to its'placewhen adjusted by a set-screw, e.v Said puppet is also provided .with alongitudinally-sliding rod, J, held by a set-screw, f, aud having at itsinner end aslotted gauge and tool-guide, g, to facilitate then'orltmanin turning the work to a given length, as, for instance, the spindle Yof a'n'atch-pinion, represented by red lines in fig. 1. For delicateWork, this gauge and the reversible male and female eentring-pin in theone puppet will be found very convenient, Aand save much time andlabor.. The

turning of the work to a iixe'd gauge, acting as a guide to the tool,'as is the case here, not `merelyV expedites,

performance of the work and insures accuracy, but also avoids muchstooping-and straining' of the eyes.

What I here claim, and desire to secure by Letters Pntent,iis- Y 1. The`chuck E, with its clamping-bars YF F,fpivoted and arranged 'foroperation'substantially as described. 2. The combination, with lthepuppet H, of the gauge-bar J, with its'tool-guide and gauge g, andreversible male and female centring-rod I, essentially as specified. i.

. FREDERICK' SHALLER.

Witnesses: I JNO. B. LONGLEY,

WHEELER H. CLARKE.

